[Gate-users] GeomTest Error: Overlapping daughter volumes and overshooting daughter volume

[Ida Häggström]

Dear Simon and Niklas,
thank you for your quick replies! Ok, so it seems that the geometry overlaps
might be the root to my segmentation violations then... The reason I checked
the benchmark camera is just cause I ran another one as well, and thought
that maybe there was some fault in that setup. When I found errors in the
benchmark as well I got really confused... anyway, I will try and dig deeper
into this and see how I can change the camera setup to avoid this. Hopefully
this will enable me to run with no problems! =) Thank you for your valuable
insight, and I'll let you know how it works out!
Sincerely,
Ida

Den 24 september 2009 10.58 skrev Simon Stute <gate.stute at gmail.com>:

> Hi Ida,
>
> I have never checked if there is any overlap in the benchmarkPET camera,
> but I know the Geant4 policy for overlapping volumes.
> They strickly say that the behaviour of the code in such cases is unknown,
> and that one must avoid making overlaps in volume geometry.
>
> I have also already experienced some overlaps (between phantom and
> shielding) and it always resulted in Seg Viol, until I found this overlap.
> So it could be that !
>
> Good luck,
> Simon
>
> 2009/9/24 Ida Häggström <ida.haggstrom at radfys.umu.se>
>
>> Hello!
>> I run a main macro in Gate where I have a camera, phantom, source etc
>> described. I added the line "/geometry/test/recursive_test" after I
>> initialize the simulation in my main macro file, to check that the geometry
>> setup is ok. I get some errors like:
>>
>> GeomTest Error: Overlapping daughter volumes
>>     The volumes module_P[10] and module_P[9],
>>     both daughters of volume head_P[0],
>>     appear to overlap at the following points in global coordinates: (list
>> truncated)...
>> ....
>> GeomTest Error: Overshooting daughter volume
>>     The volume LSO_P[0] appears to extend outside the mother volume
>> crystal_P[0]
>>     at the following points in global coordinates: (list truncated)...
>> ....
>>
>> for different parts of my camera and phantom. Even when I comment out the
>> phantom and just run the camera I get errors. I find this a bit weird since
>> I've just copied the camera from the benchmarkPET straight off, no changes.
>> Maybe these errors aren't important and can be ignored, I don't know. Can
>> these cause segmentation violations and abort entire runs as I described in
>> a previous post ("segmentation violation aborts my run")?
>> Thanks!
>> Ida
>>
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>>
>>
>
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